Fluid-pressure brake



C. C. FARMER.

FLUID PRESSURE BRAKE.

APPLICATION men AUG-7, 1920.

INVENTOR CLYDE C. FARME R ATTORNEY UNITED STTEQQ QEFIQE.

CLYDE G. FARMER, OF EDGEWOOD, PENNSJYLVANIA, ASSIQNOB T0 III-IE WESTING HOUSE AIR BRAKE COMPANY, OF VJILMERDZNG, TPEEIITSYLVANIA, A COR?ORA- 'IION OF IENNSYLVANIA.

FLUID-PRESSURE BRAKE.

Application filed August 7, 1920.

To all whom it may concern:

Be it known that I, CLYDE CLFARMER, a citizen of V the United States, residing at Edgevvood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in F luid-Pressure Brakes, oi Which thefollowing is a specification.

This invention relates to fluid pressure brakes, more particularly to a straight air emergency brake equipment.

lVith equipment of the above character, it has heretofore been proposed to provide an emergency valve device adapted upon movement to emergency position, to cut oil communication from the main reservoir to the main reservoir pipe leading to thebralre valve device, so that, among other. reasons,

it the main reservoir pipe should break or leak, loss of main reservoir pressure and brake cylinder pressure, by low to the main reservoir pipe, When the brakes are applied,

tion of same by mechanical manually operated means, so that the length of the connecting pipe is reduced and also the liability of the pipe to breakage.

In the accompanying drawing, the single figure is a diagrammatic view, partly in section, of a. fluid pressure brake equipment with my invention applied thereto. 7

As shown in the drawing, the equipment may comprise an emergency valve device 1, z. brake cylinder 2, a main reservoir 3, a brake valve device 4: at each end of the car, a release valve mechanism 5, and a manually operated device 6 at each end of the car for controlling the operation of the release valve mechanism.

The emergency valve device 1 comprises a casing having a piston chamber 7, concasing Specification of Letters ffatent. Patented Beg, 20, 1921',

Serial no. 401,897.

nected to brake pipe 8, and containing piston 9, and ,a valve chamber 10, connected to the main reservoir 3, and containing a slide valve 11, adapted to be operated by piston 9. c

The release valve mechanism 5 may comprise a casing having a valve chamber 12,

connected to the brake pipe 8, and containing a puppet valve 13 carrying a downwardly extending stem i l and an upwardly Xtending stem 15, the valve 13 being for the purpose of preventing; leakage from chamber 12 past the stem When the valve is seated.

The casing also has a valve chamber. 16,.

connected by pipe 17 to the main reservoir 3,

and containing a puppet valve 18 adapted to be operated by the stem for supplying fluid under pressure from the main reservoir to valve chamber 19 and the brake pipe 8.

An operating member is pivotally mounted Within the casing and has an arm 19 adapted to engag the stem 14 and arms 20 each connected to a chain 21 leading to the manual operating device 6 at each end of the car.

Each operating device 6 may comprise a within Which is mounted a shaft 22, at on end a drum 23 to Whiclrthe carryin chain 21 is attached, and provided at the other end with an operating handle 24..

The usual strai ht air pipe 25 is connected to each brake valve device at and leads to.

the seat of slide valve 11 and in the normal release position of the slide valve is con nected through cylinder 2. c

A main reservoir supply pipe 27 is connected to each brake valve device, and leads to the seat of the emergency slide valve 11.

cavity 28 with the brake 7 In operation, when the emergency slide valve 11 1s in normal release position, as

shown in the drawing, fluid under pressure is supplied from valve char ber 10 and the main reservoir 3, through port 28 in the slide valve, to the m in reservoir supply pipe 2?, so that the brake mlve device t is supplied for permitting the usual manipulation of the brake valve in controlling the app ication and release of the brakes.

Upon a reduction in brake pipe pressure the emergency piston? shifts the shde valve with fluid from the main reservoir" I is ,11 to emergency position, in which fluid is supplied from valve chamber 10' and the main'reservoir 3, directly to the brake cylinder am the usual manner.

In this positlon, the mam reservoir supply pipe 27 is cut off from the maln reser-' voir, so that the brakes cannot then be released by manipulation of the brake valve. vIf the operator desires to release the brakes, he turns one of the handlesQ, so: as

to Wind up the chain 21 andthereby oper- 19 is operated to lift the stem 14.

The stem thenunseats the valve 18, so that fluid under pressure is supplied from the main reservoir 3, through pipe 17 to the brake pipe 8, thereby increasing the pressure in the brake pipe, so that the emergency pis ton 7 will be shifted to release position.

In order to lock the release valve mecha ,ni'smin its pen positiomthe handle 24: may be slidably mounted on the shaft 22 to which the handle is rotatably connected by a spline 28 and the hub 290i the handle may be provided with a tooth 30"adapted upon lateral slidingmovement of the handle to engage a corresponding notch 31 in the member 6 and adapted to aline with the tooth 30 when the handle is turned to its release valve operatingfposition.' V p l In order to prevent rapid loss of main reservoirpressure in case the emergency brake pipe 8 should" brake and for some reason the valve 18 should fail toseat, a choke plug 32 having a restricted port, may be interposed in the passage connectingthe pipe 17 with the valve chamber '16.

Having now described my invention, What Icla'imas new and desire to secure by Letters Patent, is 1 V v 1; In a fluid pressure brake, the combination with a brake pipe and an emergency valve device operated upon a reduction in brake pipe pressure for effecting an application of the brakes, of a source of fluid under pressure, a release valve mechanism for supplying fluid from said source to the brake pipe to effect the release of the brakes, and

means at each end of the car for operating said release valve mechanism.

2; In a fluid pressure brake, the ccmblnation with a'brakepipeand an emergency valve device operated upon a reduction in brake pipe pressure for eliecting an application of the brakes, of a source of fluid under pressure, a release valve mechanism for supplying fluid from said source to the brake pipe to effect the release of the brakes, and 'mechanical manually operated means at each end of the car for operating, saidrelease valve mechanism. r

3. In a fluid pressurebrake, the combina tion with a brake pipe and an emergency valve device operated upon a reduction in brake pipepressure'for eifecting'an applica-V pressure, a release valve mechanism located near said source andoperative to supply fluid from said source to the brake pipe to eflect v the release of the brakes, and means at each end of the car for operating said'release valve mechanism. 7 V 4. In a fluid pressure brake, the combination With a brake pipe and an emergency valve device operated upon a reduction in brake pipe pressure for effecting an application of thebrakes', of a main reservoir, a release valve mechanism located near the main reservoir and operative to supply fluid from the mainreservoir to'thebrake pipe to effect the releaseof'the brakes, and means-at each end of the car for operating said release valve mechanism. r 5. In a fluid pressure brake, the combina tion with abrake valve device, a brake pipe, and. an emergency valve device's operated upon a reduction inbrake pipe pressu-reior efiecting an application of the brakes, of a main reservoir, a release valve mechanism located adjacent to the emergency valve device and operative to supply fluid from the main reservoir to the brake pipe to effect the release oftlie brakes and ahandle located adjacent'to the brake valve'device and operatively connectedto the release valve mechanism. u

6. In a fluid pressure brake, the combination With a brake pipe, an emergency valve device operated upon areduction in brake pipe pressure for effecting an application of the brakes, and a brake-valve device for con trolling the brakes, of a main reservoir, a main reservoir supply pipe connected to said .brake valve device and adapted to the charged from the main reservoir through a port controlled by said emergency valve device and' a release valve mechanism operative to supply fluid under pressure from the main reservoir to the brake pipe to effect the releaseo-f the brakes. i

7. In a fluid pressure brake, the combination Withabrake pipe, an emergency valve device operated upon a reduction in brake pipe pressure for eflecting an application of the brakes, and a brake valve device for controlling the brakes, of a main reservoir,

a mainreservoir supply pipe connected to said brake valve device, the emergency valve 7 device being operative in release position to supply fluid from the main reservoir to said supply pipe and in emergency position to out off the supply and a release valve mecha-' nism for supplying fluid from the main reservoir to the brake pipe to eiiect the release of the brakes 'When the emergency valve device is in emergency position;

In testimony whereof I have hereunto set my hand. a

e CLYDE o. manna. 

